The grace which makes any a man a Christian from the first moment of his coming to believe is the same grace which made this man the Christ from his coming to be as man. The Spirit through whom men are reborn is the same Spirit through whom Christ was born.
As Christians, we do not worship the mysteries of faith as mere spectators; we consent to allow the mysteries to step into us and become who we are at our deepest identity. As the sacrifice of the Eucharist gives us a weekly rebirth as the Body of Christ, risen to the Father but still present on earth in the Spirit, the birth of Jesus in Bethlehem and our definitive rebirth in baptism approach a unity. This is the eschatological unity when Christ will be "all in all," the goodness of the Father having been multiplied through having been shared with a multitude of disciples through the ministry of Christ, and rolled back into the heavenly kingdom at the end of time.